MCQ
Which of the following is isoelectronic pair?
- A$\text{ICl}_2,\ \text{ClO}_2$
- ✓$\text{BrO}_2^-,\ \text{BrF}_2^+$
- C$\text{ClO}_2,\ \text{BrF}$
- D$\text{CN}^-,\ \text{O}_3$
✓
Answer
Correct option: B.
$\text{BrO}_2^-,\ \text{BrF}_2^+$
Isoelectronic pair have same number of electrons.
- $\begin{cases}\text{ICl}_2=53+2\times17=87\\\text{ClO}_2=17+16=33\end{cases}$
- $\begin{cases}\text{BrO}_2^-=35+2\times8+1=52\\\text{BrF}_2^+=35+9\times2-1=52\end{cases}$
- $\begin{cases}\text{ClO}_2=17+16=33\\\text{BrF}=35+9=44\end{cases}$
- $\begin{cases}\text{CN}^-=6+7+1=14\\\text{O}_3=8\times3=24\end{cases}$
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